Office



w. B. DAVIDSON. @As AND mourn com/CT APPARATUS, APPLICATION FILED MAR.I5. 191,8.-

Patented July 1,- 1919.

`S H EE T 2.

-3 sHEEJrs W. B. DAVIDSON:

GAS AND LIQUID CONTACT ARPARATUS.

APPLlcATIoN F1110 1 /m15. 191s.

Patented July 1, 1919.

3 ,SHEETS-,saar s.

, i 'the King of Great Britain, and residingat e' To all whom t mayconcern:

if lli wILLIaivI LDOwN DAVIDSON, or IIUDDDiesiiILLD, ENGLAND.

i eas eNDfLIeUID CONTACT APPARATUS.

f Specification of Letters Patent.

Fatientietl July il, limiti.

Application ffiled March 15, 1918.v "Serial 7610.222322.

lBe it known that l, 'WILLIAM B ROWNI DAVIDSON, D. Sc., Ph. D., F. l.C., subject of Kalirlroad, Huddersfield, in tlie county of Yorkshire,England, chemical engineer, have inventedA certain new and usefulImprovements in Gras and 'Liquid Contact Apparatus,of which thefollowing isla specification.

The inventionv comprises improvements `in apparatus for bringing'liquids and gases, vapors, fumes', or the` like into"intimate c ontactfor suoli purposesas washingout impurities, rectification, effectingsolutions A,and tlielike. -f

The invention refers toen apparatus. of the typein which a succession ofsuperposed f chambers are each provided with rotating liquid sprayingmeans and passages are provided from chamber to chamber up theappointedlout in. the claims.

Figure lis a sectional -view of one half of a chamber of the apparatuswith another cli-amber superposed thereon. j FigQlQ isa section on line2-2 of Fig. 1.

'3. is a similar view to Fig. 1 but showira modification of the sprayingmeans.'

ig. `4 is a sectiony on linee- 4 ofFig.' 3.

Fig 5 is a. similar lview toFig. 1` but showing a furtherl modification,the section being taken on line 5- 5 4of Fig. 6.'

Fig. 6 is a section on vline 6 6 of Fig. 5.

'Fig 7 is a detail .of a sprayingvane.

'lhe improved apparatus as "is common with apparatus for bringingliquids or gases or vapors,^fumes or the like into contact,

such as gas washing apparatus, comprises a series ofs'uperposedchambers. -lncoinmon with existing apparatus a cylindrical or othercontainer a is built up in. sections and provided with a base plate foreach chamber and with a central driving shaft Z) coinnion to allchambers for actuating the rotating spraying means which are disposed inthe respective chambers.

|The `preferred form of base plate is a dished plate c with an upturnedperipheral edge d and a central funnel e to pass the lshaft 6. 'lhe baseplate may" be supported in any suitable .manner to the container wall[cj 'such as by means ofa ledge a1 on the wall a .andaseries ofprojecting lugs f on the base plate'support'ed by verticalribs or thelike to the ledge a1. rllhe gas passage g is referably arranged around"the edge ofthe ase vplate in each chamber and is crossed at intervalsbythe lugs f projecting from the4 platerjjj f5.' 'Unthe container wall aof each chamber ioverlianging the gas passage g around the edgeof thebase plate c is an overhanging ledge 7L to prevent sprayed liquidpassing g down the fgaspassage and toA deflect the gas away from thewall of the chamber toward the spraying means.

Eachbase plate is perforated near they central funnel e and one or moreoverflows 7 are formed or'secured in the perforations.

As illustrated the `overflows j are vertical pipes and project above thebase plate to the desired level for the liquid in the chamber .anddependbelow the base plate into proX- .imity with the spraying device ofthe Iadjacent lower chamber.

The spraying device comprises a dish-7a,

- mounted to rotate with the shaft t, and' carrying aseries of tubulararms Z`to which spraying vanesm hereinafter described are -secured. vThe dish f: has perforations o through its upstanding peripheral walljnand the perforations o communicate with the tubular arms Z. Theextremities of the overiiows j from one chamber are above, or enterinto, the dish of the sprayer in the adjacent lower chamber, so thatliquid over#l 'owing from an upper chamber is at once distributed to thespraying device of they vnext chamber. l i

One form of spraying vane is illustrated at Fig. 7 and comprises a halfround or like `scoop portion m1 an attachment portion m2 where it .isattached by outwardly bent fiangespr any other means to a collar or thelike onv an army Z and an upper serrated edged part m3, one edge ispreferably plain.

The scoop m1 dips in theliquid inthe base plate c andraises it as thespraying device is rotated with the shaft b, andthe liquid passes' upthe vane and is sprayed iOO iiO

Cril

ed its edge under centrifugal action and the small drops are flungacross the chamber and a very efiicient liquid spray is provideddesired, or I may stagger the vanes by arranging'r the arms Z ofdifferent lengths with the 'object` of preventing cavitation -of theliquid in thedished-base plate as the scoops rotate in it.

On the base plate' c fixed radial or other ribs orplat-es are providedto act as breakwaters and pre\ ent the 'spinning around of the liquid bythe rotating scoops, but apertures as at. g1 prevent any differences oflevel being created.

In the arrangement shown at Figs. 3 and 4 the spraying device ismodified by forming the arms carrying the sprayers as taperingextensions Z1 from the dished part Zt. The bottom of the dished platetoward these'f extensions Z1 is preferably inclined as at k1 Fig. 3 andan overhang or hood over `the extensions or part theieof is preferablycurved as at Z2. It will be seen from-thc plan that the extensions Z1instead of being radial to the sprayer axis are set substantiallytangential thereto so that the entrance mouthor aperture o1 leading fromthe vdished part Ze to the spraying vane m lat the extremity of theextension, islin advance of the vane during rotation in the directionindicated by the arrow, and the converging sides ofthe extensions Z1facilitate or direct the flow of liquid from the dish to the sprayingvanes. l j

In this construction I .have shown the dished base plate c with apronounced well lpart c1 where the scoops of the spraying devicesrotateand the overflows j are carried through this well part. Theoveriiows instead of circular section may follow the Ashape indicated bytheplan in dotted lines In' the arrangement illustrated at Figs..

5 and y6 the spraying device is modified by omitting jthearms"Z vand.enlarging the dished part '7c and mounting the spraying vanes mAdirectly on the wall of the dish.

The apertures' 0 in the wall 'n of vthedish in this case/lead directlyinto thespraying varies fm. In l"this case also if desired, the

additional scoopsp may be employed but .would lead through-the bottomofthe dish projecting rib s to fit grooves in the shaft and the twoparts of the spraying device are bolted together on the shaft, sec forexample Fig. 2. The spraying devices are suitably keyed on the shaft sothat all rotate with the shaft. Any means for driving the. shaft may beemployed.

As shown I may arrange upstanding ribs or plates t on the base plates cbetween the breakwaters g so that as the gas passes through the sidepassage 'g and inwardly toward the shaft to pass the overhanging ledge hthe gas comes into contact with the liquid drops on the ribs or plates tand a. scrubbing action is effected. .As shown at Figs. 3 and 4 I mayemploy a grid extension u from the ledge L over the upper edges of theribs or plates t the grid having numbers of slots or perforations, asclearly shown at Fig. L

l. In apparatus for bringing liquids into intimate contact with gases,vapors, fumes, and the like, the combination of .a casing formed by aplurality of superposed chambers, a base to each chamber, rotating meansin said chambers, spraying devices on said rotating means in saidchambers, a passage at the outer edge of said base in each chamber, andliquid overflows passing through said base in each chamber, saidoverflows projecting above the bottom of said base and depending belowsaid base well within thecircular path described by the spraying means.'4

2. In apparatus for the purpose set forth, the combination of a casingcomprised of superposed chambers, with a base to each chamber androtating means in said chainbers with spraying means thereon, a passagebetween the outer edge of said base and the casing in each chamber, andliquidoif'eriiows passing through said base in each chamber; saidspraying means having a collecting portion and said overflows projectingabove the bottom of said base and depending below same to deliveroverflow liquid into said collecting portion of saidspraying means.

3. In apparatus for thel-purpose set forth, the combination of a casingcomprised of superposed chambers, with a Abase to each chamber, arotating shaft in said chambers witlispraying means thereon, a passagetween the outer edge of said base and the casing in each cham er, andliquid overflows through said base in each chamber; said spraying meanshaving a collecting portion,

, disposed.

' incassa the combination of a casing comprised of a plurality ofsuperposedv chambers a base to each chamber, rotating means in saidchambers, spraying devices on said rotating means in said chambers, a.passage between the outer edge of said base and said casing ini eachchamber, and liquid overflows through said base in each chamber, saidspraying dei vices comprising separated vanes with scooplill like partsprojecting toward said base and said overflows projecting above thebottom of said base and depending below said base well within thecircular path described by:

said spraying varies, where collecting means communicating with thespraying vanes is 5. ln apparatus for the purpose set forth,

the combination of a casingcomposed of' superposed chambers with a baseto each chamber said base being dished and having a central funnelportion, a rotating shaft in said chambers, said shaft passing throughthe funnel portionsof said bases, spraying means on said shaitineachchamber, said spraying means comprising a dish like col.

lecting partadjacent' to the shaft and up# standing hollow van'es havingdownwardly projecting liquid scoops, said collecting part havingcommunication with said vanes, a passage between the outer edge of eachbase and casing, saidl passage' being adjacent to the wall ofthe'ehamber, andoveriows disposed ineach base, said overflows havingportions projecting above thebottom of said base and having downwardlydepending portions below said base, said depending portionscommunicating with the collecting p art of said spraying means.

6. ln apparatus for the purpose set forth, the combination of a casingcomposed of superposed chambers,.with a base to each chamber, said basebeing dished and having aA central funnel portion,a rotary shaft in saidchambers, said shaft" passing through the funnel portions ofsaid base,spraying nieans'on said shaft in each chamber, said spraying meanscomprising a dish like collecting part adjacent tothe shaft andupstanding hollow vanes 'having downwardly projecting liquid scoops,saidcollecting part4 havingcommunication with said vanes, ad-

i ditionliquid raising scoops associatedwith portions projecting abovethe bottom of saidv |30.

said spraying means, a passage between the fouter edge of each base andcasing, said passage being adjacent to the-wall of the chainber,` ay'guarding and dedecting ledge overj hanging said passage, and overdows'disposed in each base, said overflows having base and haviiigdownwardly depending portions below said base, said depending poi'- ltions communicating'with the'collecting part dii of'saidispi'aying'me'an's'l 7, ln apparatus for the purpose set forth,

the combination of a casing composed of superposed chambers, with a baseto each chamber, said basebeing dished and having a central funnelportion,V a rotary shaft in said chambers said shaft passing through thefunnel portions of said bases, spraying means on said shaft in eachchamber, said spraying means comprising a boss for mounting on'saidshaft, a collecting dish portion surrounding said boss, 'hollowextensions piojectiiig from said collecting dish and spraying vanesmounted on said hollow extensions and said extensions leading from saiddish to said spraying varies; a passage `between 'the outer edge of eachbase and cas- `ing said passagebeing adjacent to the wall of thechamber, and overflows disposed in each base, said overdows havingportions projecting above the bottom of said base and having downwardlydepending portions below said base, said depending portionscommunicating with the collecting part ofv said spraying means.

l 8. ln apparatus for the purpose set forth,l

the combinationv of a casing composed of 4superposed chambers with abase to each chamber, said base being dished and having a central funnelportion,

a rotary shaft in said chambers,

said shaft passing through the funnel portions of said bases, sprayingmeans o'n said shaft in each chamber, said spraying means comprising aboss for mounting on said shaft, a collecting dish `portion surroundingsaid boss, hollowy extensions projecting from `and in conimiinicationwith said collecting dish and .spraying vanes' mounted on said holloweXtensions, said spraying vanes having an upl standing, spraying portionand a downthe combination of a casing composed of a plurality ofsuperposed chambers each having a surrounding container walland a base,

said base having a dished form with a raised peripheral edge, lugsprojecting from said` till ict

llll

lllli base beyond said edge, a ledge on said container wall, and meansfor supporting'said' base onrsaid ledge, by means of said lugs, spacesbelow said lugs to form a passage for gases, vapors, and fumes aroundsaid i raised peripheral edge of saidbase, an over- `hanging ledge onsaid container wall protecting said passage in each chamber; rotary `berto the next lo-wer chamber.

p lurality of superposed chambers each having a surrounding containerwall and a base said base having a dished form with a raised .peripheraledge, lugs projecting from said base beyond said edge, a ledge on saidcontainer wall and means for supporting said base on said ledge, apassage for gases,

vapors, and fumes around-said raised pe-` ripheral edge of said base, anoverhanging ledge on said container wall protecting said passage in eachchamber; rotary means in said chambers and spraying devices on saidrotary means -in each chamber and liquid overflowsin said base from onechamber tothe next lower chamber, and upstanding means on each base vtoprevent the liquid in said-'chambers being carried.. around with therotary spraying devices, and apertures in said means to preventinequalities of liquid level occurring. y

11. In apparatus for the purpose set forth the combination of ascasingcomposed of a plurality of superposed chambers each havinga surroundingcontainer wall and a base,

saidfbase having a dished form with a raised.

peripheral edge, lugs projecting from said base beyond that edge, aledge on said container wall and means for supporting said base on saidledge, a passage for gases,

Lacasse vapors, and funi-es around said raised peripheral edge of saidbase, an overhanginfr ing devices each comprising a boss by which saineis mounted, a surrounding eollectinnl dish, hollow extensions from saiddish an spraying vanes at the extremities of said extensions liquidoverflows in said base `from one chamber to the next lower chainber,said overiiows having a portion projecting above the bottom' of saidbase and a portion depending b'elow said base into the col'- lectingdish of said spraying means ,in said next lower chamber. i

12.v In apparatus for the purpose set forth, the combination of a casingcomposed of superposed chambers with a base t0 each chamber and'rotatingmeans in said chainbers with spraying means thereon, a passage betweenthe outer edge of, said basefand said easing in each chamber, and liquidoverlows through said base in each chamber; said sprayingimeanscomprising a'eollecting portion and extensions from said portioncarrying spraying vaiies 'said extensions liav-.

ing converging sides, and said oif'erfiowspro.-A

jecti-iig above the bottoni of said base and` depending below the sameto deliver overflow liquid 'into said collecting'vtr portion of saidspraying vanes: Y

In testimony whereof I afiix my signature.

WILLIAM BROWN DAVIDSON.

